Bravo for a beautiful site!
As I mentioned elsewhere, there is room for improvement, and it is certainly within the capacities of a Genius Developer like you:
When you make a match, and double-click the Red Circle, it does not put Xs in the file and column, 'crossing the tee'.
Crossing tees is very time-consuming. It slows me down, and distracts me from reasoning. This really needs fixing.
Please make it so.